//
//  ViewController.m
//  CoreData53
//
//  Created by dllo on 15/11/20.
//  Copyright © 2015年 沈浩. All rights reserved.
//

#import "ViewController.h"
#import "CoreDataManager.h"
#import "Student.h"
@interface ViewController ()
@property(nonatomic, strong)CoreDataManager *manager;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    self.manager = [CoreDataManager defaults];
    
    NSLog(@"url ==== %@", [self.manager applicationDocumentsDirectory]);
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (IBAction)add:(id)sender {
    // 创建实体描述
    // 参数1:描述的实体              // 参数2:数据管理器
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Student" inManagedObjectContext:self.manager.managedObjectContext];
    // 创建实体
    // 参数1:实体描述
    // 参数2:数据管理器
    Student *stu = [[Student alloc] initWithEntity:entity insertIntoManagedObjectContext:self.manager.managedObjectContext];
    
    stu.name = @"成精";
    stu.age = @1000;
    stu.ses = @"?";
    stu.hobby = @"吹🐂 13";
    stu.number = @213;
    
    [self.manager saveContext];
}
// 查找
- (IBAction)select:(id)sender {
    // 获取查询数据的请求,相当于数据库的查询语句
    NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"Student"];
    // 2. 添加一个约束 谓词
    NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"%@ == %@", @"name", @"%@"], @"成精"];
    
    request.predicate = predicate;
    // 3. 通过某个key给数组排序
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
    
    [request setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor, nil]];
    
    NSError *error;
    NSArray *array = [self.manager.managedObjectContext executeFetchRequest:request error:&error];
    
    
    NSLog(@"%ld", array.count);
}
// 修改
- (IBAction)update:(id)sender {
    // 获取查询数据的请求,相当于数据库的查询语句
    NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"Student"];
    // 2. 添加一个约束 谓词
    NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"%@ == %@", @"name", @"%@"], @"成精"];
    
    request.predicate = predicate;
    // 3. 通过某个key给数组排序
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
    
    [request setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor, nil]];
    
    NSError *error;
    NSArray *array = [self.manager.managedObjectContext executeFetchRequest:request error:&error];
    
    
    
    Student *stu = [array lastObject];
    stu.ses = @"好像是个女的";
    [self.manager saveContext];

}
// 删除
- (IBAction)delete:(id)sender {
    NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"Student"];
   NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"%@ == %@", @"ses", @"%@"], @"?"];
    
    request.predicate = predicate;
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
    [request setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor, nil]];
    
    NSError *error;
    NSArray *array = [self.manager.managedObjectContext executeFetchRequest:request error:&error];
    
    for (Student *stu in array) {
        [self.manager.managedObjectContext deleteObject:stu];
    }
    
    [self.manager saveContext];
    
//    // 1. 需要一个请求
//    NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"Student"];
//    // 2. 添加一个约束
//    NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"%@ == %@", @"ses", @"%@"], @"男"];
//    request.predicate = predicate;
//    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
//    [request setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor, nil]];
//    NSError *error = nil;
//    NSArray *array = [self.manager.managedObjectContext executeFetchRequest:request error:&error];
//    for (Student *stu in array) {
//        [self.manager.managedObjectContext deleteObject:stu];
//    }
//    // 一定要保存数据
//    [self.manager saveContext];
    
}


@end
